Before I start, I should say that I also own a Tepui 3 person roof tent. So i'm not completely biased.
Below is my current sleeping setup that I find better than my Tepui for me, my wife and my two kids that are 4 years and 1 year (lots of grey hairs coming in these days)
-arb 2500 awning with arb awning room (8 feet by wide by 8 feet long and about 6'5'' tall)
-coleman queen size air mattress
-cots for the kids
The pros to the arb awning tent set up is:
-PRICE. my awning and room combo was just under 400 dollars retail. the mattress was about 70 dollars and 2 kid cots were 50 dollars total. My Tepui rtt was 1400 before tax.
-light weight ( the awning, room and bedding is significantly less than a rtt). we also do somewhat harder trails and I've noticed a huge difference when the roof tent is on. the truck feels less stable.
-doesn't kill your roof clearance or mpg (we garage our rig, and some trails have low branches that could catch the roof tent)
-easy to set up solo
-doubles as shade/protection during hot or rainy days
-its rated to cook in as well (lots of windows)
The roof tent still has some pros over the awning room, though. For instance, you cant level out the awning room like you can with your truck. We've spent a couple nights on a mild slope that was a bit annoying when sleeping. with our tepui, I could level it out with our recovery boards and be nice and level.
lastly, we enjoy the extra cargo space for whatever. with the tent removed off the roof and the awning attached to the side for our sleeping setup, it leaves my roof open for a cargo box, kayak, etc...